Emil’s a canonically gay character in the games Nier and Nier: Automata, though he has a far more prominent role in the former. He’s one of the main protagonists alongside with Kainé, Grimoire Weiss, and, well, Nier. The director of Nier confirmed his sexuality (alongside with Kainé’s intersex status) in this interview. He also makes quite clear that Emil has romantic feelings towards the main protag, Nier, including one scene where he wistfully wishes they could get married. There are other nods to this in-game as well, though when localizing the game to the West, they were almost all cut. Might have something to do with the changes made into Nier’s design, considering he was aged up pretty noticeably.